Overview:

“Find 30 people to come to the Demon Castle party!”
One day, the king received a letter from the demon king, the old enemy of mankind.
Although it was obviously a trap, the king decided to take advantage of this opportunity to suppress the Demon Castle.
The chosen commander is the newcomer Rutherford.
Rutherford accepted the king’s entrustment and embarked on the journey of looking for 30 companions with different personalities to attack the Demon Castle.